Heney j



(No Model.)

L H. J. MARK.

AVENEBRGUIING KNIFE. 1

` No. 288,463;f Patented Nov. 13,1883.-

. Awww 4 NITE STATES PATENT OFFICE.

HENRY J. MARK,OF ST. LOUIS, MISSOURI.

VENEER-CUTTING KNIFE.

SPECIFICATION forming part of'Letters Patent No. 288,463, dated November 13, 1883.

Application filed June 2, 1883.

To @ZZ whom t 'may concern:

Be it known that I, HENRY J. MARK, of St.\Louis, Missouri, have made a new and useful Improvement inVeneer-Cutting Knives, of which the following is a full, clear, and exact description, reference being had to the"` annexed drawings, making part of this specification, in which- Figure lis afront elevation,showing a portion of the improved knife; Fig. 2, a rear 'elevation; Fig. 3, a section on the line 3 3 of Fig. 1, and Fig. 4 a section on the line L 4 of Fig. 1.

The same letters of reference denote the same parts.

This invention is an improvement in corrugated veneer-cutting knives.

A represents a veneer-cutting knife of the kind under consideration. The corrugations a a are inclined to the edge a, which is waved, as shown. Now, as such knives have hitherto been made, it is extremely diiiicult to temper them, and the knife-edge soon becomes dull. The blade warps badly, and its edge cracks in the tempering, and in use has to be reground and honed every day or two. To obviate these difficulties is the aim and effect of this improvement, which consists partly in making the knife composite and partly in making the blade substantially of the same thick ness from top to bottom, the bevel at the lower edge of the knife being quite blunt, as shown, and the (No model.)

two materials composing the blade extending to the beveled edge at.

The knife is composed of a steel face, and an iron backing, a3. rIhe iron must extend at least half through the thickness of the knife, and better results are obtained'when the knife is three fourths of iron. The iron and steel are welded together. The iron does not warp from warping. The iron also does not heat in use, and the steel, in consequence, does not heat as rapidly; and, by reason of the blunt- ,i ness of the blade, the cutting-edge a retains l its sharpness t-o such a degree that the knife can be used six months without sharpening.

I have heretofore, November 8, 1881, jointly with another party, patented an improvement in veneer-cutting knives. The construction referred to was objectionable for the reasons above set forth, the blade being wedge-shaped, and but a single material being employed.

I claim- A corrugated veneer-cutting knife having a steel face and an iron backing, and made blunt at its lower edge, substantially as described.

HENRY J.` MARK.

Vitn esses C. D. MOODY, A. J. VANDEGEIFT.

during the tempering, and being in excess of 4o the steel, or equal thereto, it prevents the steel T 

